共 30 条
- [21] HELLINGA JJA, 1940, AKAD WETENSCHAP P, V43, P249
- [22] HUELIN FE, 1932, GREAT BRITAIN DEPT S, P51
- [23] ISAAC WM. EDWYN, 1938, TRANS ROY SOC S AFRICA, V26, P307
- [24] KIDD F., 1933, GREAT BRITAIN DEP SC, P55
- [25] KIDD F, 1934, GREAT BRITAIN DEPT S, P51
- [26] Miller EV, 1940, J AGRIC RES, V60, P0269
- [29] SMITH AJM, 1933, GREAT BRITAIN DEPT S, P156
- [30] Truog E, 1915, J IND ENG CHEM, V7, P1045